Public water system · IA0932001
ActiveJanesville Water Supply
At a glance
Janesville Water Supply (PWSID IA0932001) is an active community water system in Bremer County, Iowa. It reports serving 1,034 people through 483 service connections. Its primary water source is purchased groundwater, and EPA lists it as owned by a local government. EPA's records list 11 violations for this system; 5 are health-based, and the most recent began in November 2010.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,034
Service connections
483
Primary source
GWP
Purchased groundwater
System type
CWS
Community water system
System record
How does Janesville Water Supply compare with other water systems in Bremer County?
By EPA's size categories, Janesville Water Supply is a small system (501 to 3,300 people). Bremer County has 16 active public water systems, and Janesville Water Supply is the 6th-largest of them by population served. Its population served is well below the county average of 3,535 people per system, and accounts for 1.8% of the 56,553 people reported by systems filed under the county. Across Iowa, the 1,828 active systems average 1,718 people each. Nationally, the average active community water system reports serving 6,703 people, so Janesville Water Supply is well below that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Iowa has 1,084 active community water systems, 59% of the state's 1,828 active systems. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own. 156 Iowa systems (8.5%) list purchased groundwater as their primary source.
Who owns and regulates Janesville Water Supply?
EPA lists Janesville Water Supply as owned by a local government. The IA state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 10 of the 16 active systems in Bremer County (63%) are also owned by a local government.
Does Janesville Water Supply have drinking water violations?
EPA's records list 11 violations for this system; 5 are health-based, and the most recent began in November 2010. The violations listed here began between July 1979 and November 2010. By type: 6 monitoring and reporting and 5 contaminant level above the legal limit. The contaminant or rule involved most often is Nitrate (7 of them). EPA lists 7 as resolved and 4 as archived. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2010-11-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2010-11-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2002-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Arseniccode 1005 | No | Resolved |
| 2000-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Combined Radium (-226 and -228)code 4010 | No | Resolved |
| 1996-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Resolved |
| 1994-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Resolved |
| 1992-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1985-01-30 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Archived |
| 1983-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Archived |
| 1981-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Nitratecode 1040 | Yes | Archived |
| 1979-07-25 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Nitratecode 1040 | Yes | Archived |
All 11 violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Janesville Water Supply: frequently asked questions
Who runs Janesville Water Supply?
Janesville Water Supply (PWSID IA0932001) is a community water system owned by a local government. It is regulated by the IA state drinking water program.
How many people does Janesville Water Supply serve?
Janesville Water Supply reports serving 1,034 people through 483 service connections in Bremer County, Iowa.
Where does Janesville Water Supply get its water?
EPA SDWIS lists this system's primary water source as purchased groundwater. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own.
Does Janesville Water Supply have any drinking water violations?
EPA's records list 11 violations for this system; 5 are health-based, and the most recent began in November 2010. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Janesville Water Supply's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. EPA's records list 11 violations for this system; 5 are health-based, and the most recent began in November 2010. For current results, consult the system's annual water quality report, EPA ECHO, or the IA state drinking water program.
Where can I find Janesville Water Supply's water quality report?
As a community water system, Janesville Water Supply must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Bremer County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Ia Regional Utilities Assoc (Waverly) | Bremer + 7 more | 37,820 | Community | Groundwater |
| Waverly Water Department | Bremer | 10,394 | Community | Groundwater |
| Sumner Water Supply | Bremer | 2,030 | Community | Groundwater |
| Denver Water Supply | Bremer | 1,919 | Community | Groundwater |
| Tripoli Water Supply | Bremer | 1,191 | Community | Groundwater |
| Readlyn Water Supply | Bremer | 845 | Community | Groundwater |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Janesville Water Supply, PWSID IA0932001, Iowa”, https://aquacensus.com/water-systems/iowa/janesville-water-supply-ia0932001 (data as of October 1, 2026).